Optical Receiver Threshold Tuning for Stable BER Optimization
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Solution Overview
Problem
Current methods for adjusting the decision threshold of optical receivers in optical communication systems often result in large-range adjustments, which can destabilize the system and affect reliability, especially when external factors change suddenly.
Innovation Solution
A method and apparatus that determine a fixed adjustment range and step size for the decision threshold before deployment, optimizing it based on pre-FEC bit error rates to find a global optimal value, reducing the range and step size after activation, and adjusting the threshold within a specified range to minimize bit errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If real-time large-range adjustment of decision threshold is performed based on bit error differences, then the decision threshold can adapt to signal distortion, but system stability and reliability deteriorate due to large-range adjustments and shocks
Solution Approach 1:
The patent performs decision threshold optimization in advance during the factory testing phase before the optical receiver is delivered to the user. All threshold adjustments are completed preliminarily, and the optimized threshold is then fixed and kept unchanged during actual operation, eliminating the need for real-time large-range adjustments that would destabilize the system
Solution Approach 2:
The patent applies different adjustment strategies at different stages: during factory testing, the decision threshold is dynamically adjusted in large ranges to find the optimal value; after delivery, the threshold is fixed and only allows minimal adjustments, thus adapting the system's adjustment behavior to different operational phases
2Reliability
If real-time adjustment of decision threshold is performed, then bit error rates can be reduced, but system complexity increases due to continuous monitoring and adjustment mechanisms
Solution Approach 1:
The patent performs decision threshold optimization in advance during the factory testing phase before the optical receiver is delivered to the user. All threshold adjustments are completed preliminarily, and the optimized threshold is then fixed and kept unchanged during actual operation, eliminating the need for real-time large-range adjustments that would destabilize the system
Solution Approach 2:
The system performs self-optimization during the factory testing phase through automated testing and adjustment mechanisms. The decision threshold is automatically adjusted and optimized without requiring user intervention, and the optimized parameters are then fixed for long-term stable operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach stabilizes the system by determining the optimal decision threshold before activation, reducing large-range adjustments and minimizing bit errors, thereby enhancing the reliability and stability of optical communication systems.
Implementation Method 1
an optical receiver at a receiving end restores the optical signals to the digital electrical signals of 0 and 1 through photoelectric conversion
Data Source
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AI summary
A method and apparatus for optimizing a decision threshold of an optical receiver is used to solve a problem of affecting system stability and reliability, which exists in the prior art method for adjusting the decision threshold in real-time in a large range during operation of an optical communication system. The method comprises: determining a maximum value and a minimum value of an adjustment range of the decision threshold, and determining an adjustment step of the decision threshold (10); adjusting a decision threshold value within the adjustment range of the decision threshold, and separately detecting pre-FEC BERs corresponding to different decision threshold values (11); and searching for a minimum value in the detected pre-FEC BERs, a decision threshold value corresponding to the minimum value being an optimal decision threshold value (12). The apparatus comprises a decision threshold adjusting unit, a pre-FEC BER detecting unit, a decision threshold control unit and an optimal decision threshold determining unit. The present invention is simple to implement, avoiding shock phenomena caused when the optical receiver adjusts the decision threshold frequently in service bearing working condition.